The process of adding security to various components of Internet architecture reminds me a little bit of the extensive seismic retrofitting that has been going on in California for decades. The process is slow, expensive, and occasionally intensified by a strong earthquake after which new lessons are learned. Over the past 13 years this journal has carried many articles about network security enhancements: IP Security (IPSec), Secure Sockets Layer (SSL), Domain Name System Security Extensions (DNSSEC), Wireless Network Security, and E-mail Security, to name but a few. In this issue we look at routing security again, specifically the efforts underway in the Secure Inter-Domain Routing (SIDR) Working Group of the IETF to provide a secure mechanism for route propagation in the Border Gateway Protocol (BGP). The article is by Geoff Huston and Randy Bush.

Our second article discusses Site Multihoming in IPv6. Multihoming is a fairly common technique in the IPv4 world, but as part of the development and deployment of IPv6, several new and improved solutions have been proposed. Fred Baker gives an overview of these solutions and discusses the implications of each proposal.

By all accounts, World IPv6 Day was a successful demonstration and an important step toward deployment of IPv6 in the global Internet. Several major sites left IPv6 connectivity in place after the event, an encouraging sign. Discussions are already underway for another similar event, this time perhaps lasting for as long as a week. Phil Roberts gives an overview of what happened on June 8 and provides pointers to some of the important lessons learned from this experiment.

I want to take a moment to mention the IPJ subscription renewal campaign. As you know, each subscriber is issued a unique sub-scription ID that, coupled with an e-mail address, gives access to the subscription database by means of a "magic URL." Unfortunately, sometimes the e-mail containing this URL may not arrive in the subscriber's mailbox, perhaps because of spam filtering. Additionally, readers change e-mail addresses as well as postal addresses. If your subscription has expired or you have changed e-mail, postal mail, or delivery preference, send an e-mail to ipj@cisco.com with the updated information and we will make sure your subscription is re-instated. The purpose of the renewal campaign is to ensure that we are sending copies of IPJ to the correct addresses and only to those who prefer paper copies. IPJ is always available via our website at http://cisco.com/ipj